package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @Author: xrl
 * @Date: 2022/10/10  20:12
 * @Version 1.0
 * app端网关
 */
@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1. 获取request和response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2. 判断是否是登录行为
        //获取当次请求路径
        String path = request.getURI().getPath();
        if (path.contains("/login")) {
            //是登录行为，放行
            return chain.filter(exchange);
        }

        //3. 获取token
        String token = request.getHeaders().getFirst("token");

        //4. 判断token是否存在
        if (StringUtils.isBlank(token)) {
            //设置状态码为401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            //返回
            return response.setComplete();
        }

        //5. 判断token是否有效
        //获取token中的claims信息
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //是否是过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if(result == 1 || result  == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //获取用户id
            Object userId = claimsBody.get("id");
            //存储到header中
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders ->
                    httpHeaders.add("userId", userId + "")).build();
            //重置请求
            exchange.mutate().request(serverHttpRequest);



        } catch (Exception e) {
            e.printStackTrace();
            //当AppJwtUtil.getClaimsBody(token)该处解析异常时，继续返回401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6. 放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
